Carbon collecting device, cement kiln system and carbon collecting furnace

Abstract

The utility model discloses a carbon capture device, a cement kiln system and a carbon collection furnace. The carbon capture device comprises the carbon collection furnace, a separation device and a carbon recovery device, the carbon collecting furnace is used for producing carbon dioxide, the carbon collecting furnace is provided with an airflow inlet and a tail gas outlet which are sequentially formed in the airflow flowing direction, and the carbon collecting furnace is further provided with a plurality of raw material feeding openings formed in the airflow flowing direction at intervals; the separation device is communicated with a tail gas outlet of the carbon collection furnace and can separate undecomposed raw materials; and the carbon recovery device is communicated with the separation device and is used for recovering carbon dioxide. According to the carbon capture device, the cement kiln system and the carbon collection furnace, high-temperature crust can be reduced and even eliminated.

Description

Technical Field

[0001] The utility model relates to a carbon recovery device, in particular to a carbon capture device, a cement kiln system and a carbon collection furnace. Background Art

[0002] In the related art, a cement kiln system is provided, which generates heat and carbon dioxide by means of oxy-fuel combustion, and uses the released heat to heat raw meal, so that the raw meal is thermally decomposed to generate carbon dioxide, and then high-purity carbon dioxide is collected. Among them, the decomposition of raw meal is a reversible reaction, and its decomposition rate decreases under a high carbon dioxide partial pressure. This system increases the reaction temperature to increase the decomposition rate of raw meal, making it prone to local overheating. Especially for the tail gas outlet position, since it takes time for the raw meal to be heated and decomposed, the raw meal feeding position is generally not set at the tail gas outlet position, which makes it easier for high-temperature crusting to occur at the above position. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a carbon capture device, a cement kiln system and a carbon collection furnace, which can reduce or even eliminate high-temperature crusting.

[0004] An embodiment of the present application provides a carbon capture device, which includes:

[0005] A carbon collection furnace for producing carbon dioxide, the carbon collection furnace has an air flow inlet and a tail gas outlet arranged in sequence along the air flow direction, and the carbon collection furnace also has a plurality of raw meal feeding ports arranged at intervals along the air flow direction;

[0006] A separation device communicated with the tail gas outlet of the carbon collection furnace, and the separation device can separate the undecomposed raw meal;

[0007] A carbon recovery device communicated with the separation device, and the carbon recovery device is used for recovering carbon dioxide.

[0008] In some embodiments, the separation device includes a primary separation device and a secondary separation device;

[0009] The primary separation device is communicated with the tail gas outlet of the carbon collection furnace, and the primary separation device has a primary material discharge port and a primary gas-solid discharge port, and the primary material discharge port is used for discharging the undecomposed raw meal;

[0010] The secondary separation device is communicated with the primary gas-solid discharge port, and the secondary separation device has a secondary material discharge port and a secondary gas-solid discharge port, the secondary material discharge port is used for discharging the decomposed raw meal, and the secondary gas-solid discharge port is communicated with the carbon recovery device.

[0011] In some embodiments, the particle size of the material separated by the primary separation device is greater than 45 microns.

[0012] In some embodiments, the carbon collection furnace includes a first section and a second section connected in sequence along the gas flow direction. The tail gas outlet is provided at one end of the second section away from the first section. The second section is partially bent so that the tail gas outlet faces downward, and part of the raw material feeding ports are provided in the second section.

[0013] The embodiment of the present application also provides a cement kiln system, which includes:

[0014] A carbon capture device; and

[0015] A cement kiln decomposition furnace for decomposing raw materials;

[0016] Wherein, part or all of the material discharged from the primary material discharge port is sent to the cement kiln decomposition furnace, and the material discharged from the secondary material discharge port is sent to the cement kiln decomposition furnace.

[0017] The embodiment of the present application also provides a carbon collection furnace for producing carbon dioxide. The carbon collection furnace has a gas flow inlet and a tail gas outlet arranged in sequence along the gas flow direction, and the carbon collection furnace also has a plurality of raw material feeding ports arranged at intervals along the gas flow direction;

[0018] The carbon collection furnace includes a first section and a second section connected in sequence along the gas flow direction. The tail gas outlet is provided at one end of the second section away from the first section. The second section is partially bent so that the tail gas outlet faces downward, and part of the raw material feeding ports are provided in the second section.

[0019] In some embodiments, the inner wall of the second section includes a top wall and a bottom wall arranged opposite to each other. The bottom wall includes a convex portion protruding inward, and a sharp corner is formed at the intersection of the windward surface and the leeward surface of the convex portion.

[0020] In some embodiments, the first section is vertically arranged;

[0021] The inner wall of the second section includes a top wall and a bottom wall arranged opposite to each other, and the top wall of the second section is perpendicular to the center line of the first section.

[0022] In some embodiments, the first section has a plurality of annular constrictions formed by inward contraction, and the plurality of constrictions are arranged at intervals along the gas flow direction.

[0023] In some embodiments, the first section is vertically arranged, the gas flow inlet is provided at the lower end of the first section, and a dust discharging device is provided at the lower end of the first section to discharge the settled ash and slag.

[0024] The carbon capture device, cement kiln system and carbon collection furnace of the present utility model have at least the following beneficial effects: Raw materials are fed into the carbon collection furnace from each raw material feeding port and are heated and decomposed. The heating and decomposition process of the raw materials will absorb heat, thereby reducing the nearby temperature. By selecting different raw material feeding ports to feed the raw materials, the temperature of different regions of the carbon collection furnace along the gas flow direction can be controlled, avoiding local high-temperature crust formation. And since a separation device is added to separate the undecomposed raw materials, the influence of the above-mentioned raw materials on the subsequent carbon dioxide collection is eliminated, so that the setting position of the raw material feeding port is not restricted by the requirements of raw material decomposition.

[0025] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0027] Figure 1 is a schematic structural diagram of the carbon collection furnace and pre-combustion chamber of the embodiment of the present utility model;

[0028] Figure 2 is a schematic structural diagram of the cement kiln system of the embodiment of the present utility model.

[0029] Reference numerals:

[0030] 10. Carbon collection furnace; 10b. Gas flow inlet; 10c. Tail gas outlet; 10d. Raw material feeding port;

[0031] 11. First stage; 11a. Reduced opening; 12. Second stage; 121. Windward side; 122. Leeward side; 123. Top wall;

[0032] 20. Pre-combustion chamber; 20a. Oxygen feeding port;

[0033] 30. Separation device; 31. Primary separation device; 31a. Primary material discharge port; 31b. Primary gas-material discharge port; 32. Secondary separation device; 32a. Secondary material discharge port; 32b. Secondary gas-material discharge port;

[0034] 40. Carbon recovery device;

[0035] 50. High-temperature heat exchanger;

[0036] 60. Medium and low-temperature heat exchanger;

[0037] 70. Bag dust filter device;

[0038] 80. Oxygen generation device;

[0039] 200. Cement kiln decomposition furnace;

[0040] 300. Preheater. Specific Embodiment

[0041] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0042] In the description of the present invention, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] In the description of the present invention, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0045] In the description of the present invention, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] Please refer to Figure 1 and Figure 2 This application provides a carbon capture device. The carbon capture device includes a carbon collection furnace 10, a separation device 30, and a carbon recovery device 40.

[0047] The carbon collection furnace 10 is used to produce carbon dioxide. The carbon collection furnace 10 has an air inlet 10b and an exhaust gas outlet 10c arranged in sequence along the air flow direction. It can be understood that the air flow flows in from the air inlet and flows out from the exhaust gas outlet.

[0048] The carbon collection furnace 10 has a plurality of raw material feeding ports 10d arranged at intervals along the air flow direction. The raw material feeding ports 10d are used to feed raw materials into the carbon collection furnace 10. It should be noted that the raw materials are small particulate solids rich in calcium carbonate, which can flow with the air flow. The inside of the carbon collection furnace 10 has a high temperature to provide heat for the raw materials to absorb heat and decompose. After the raw materials decompose, the particles will become smaller, and at the same time, a large amount of carbon dioxide is generated. With a plurality of raw material feeding ports 10d arranged at intervals along the air flow direction, the raw materials fed by each raw material feeding port 10d can absorb heat and decompose, so as to realize the temperature control at each raw material feeding port 10d, and further realize the temperature control at multiple positions along the air flow direction of the carbon collection furnace 10.

[0049] The separation device 30 is connected to the exhaust gas outlet of the carbon collection furnace 10, and the separation device 30 can separate the undecomposed raw materials.

[0050] It can be understood that the main component of the exhaust gas flowing out from the exhaust gas outlet is carbon dioxide, and at the same time, it is also mixed with the fed raw materials. The above exhaust gas flows into the separation device 30. Since the separation device 30 can separate the undecomposed raw materials, the setting position of the raw material feeding port 10d does not need to be restricted by the position of the exhaust gas outlet. The raw material feeding port 10d can be set near the exhaust gas outlet. By feeding raw materials into the above raw material feeding port 10d, the temperature control at the exhaust gas outlet position can be realized to avoid high-temperature crusting.

[0051] The carbon recovery device 40 is connected to the separation device 30, and the carbon recovery device 40 is used to recover carbon dioxide. It can be understood that a part of the gas separated by the separation device 30 flows into the carbon recovery device 40 for recovery.

[0052] In the above embodiment, the raw materials are put into the carbon collection furnace 10 from each raw material feeding port 10d and are heated and decomposed. The heating and decomposition process of the raw materials will absorb heat, thereby reducing the nearby temperature. By selecting different raw material feeding ports 10d to feed raw materials, the temperature of different regions along the air flow direction of the carbon collection furnace 10 can be controlled to avoid local high-temperature crusting. And because a separation device 30 is added to separate the undecomposed raw materials, the influence of the above raw materials on the subsequent collection of carbon dioxide is excluded, and at the same time, the setting position of the raw material feeding port 10d is not restricted by the requirements of raw material decomposition, thus avoiding the situation of high-temperature crusting.

[0053] It can be understood that the structure of the separation device 30 is not limited. The separation device 30 can be a single-stage separation device or a multi-stage separation device.

[0054] In some embodiments, the separation device 30 includes a primary separation device 31 and a secondary separation device 32. The primary separation device 31 is communicated with the tail gas outlet of the carbon collection furnace 10 and is used for separating the un-decomposed raw materials. That is to say, the tail gas discharged from the tail gas outlet 10c of the carbon collection furnace 10 flows into the primary separation device 31, and a primary solid-gas separation is carried out in the primary separation device 31 to separate the un-decomposed raw materials from the tail gas.

[0055] It should be noted that since the tail gas contains raw materials, and since part of the raw material feeding port 10d is close to the tail gas outlet 10c, this causes some of the input raw materials to lack decomposition time and cannot be fully decomposed, which will result in more raw materials being discharged. By providing the primary separation device 31, the above-mentioned un-decomposed raw materials can be fully separated.

[0056] The primary separation device 31 has a primary material discharge port 31a and a primary gas-material discharge port 31b. It can be understood that the primary material discharge port 31a is used to discharge the separated materials, where the materials are the un-decomposed raw materials. The primary gas-material discharge port 31b is used to discharge the separated gas part. It should be added that the separated gas part still has some solid materials with smaller particle sizes.

[0057] The secondary separation device 32 is communicated with the primary gas-material discharge port 31b and is used for separating the decomposed raw materials. That is to say, the air flow discharged from the primary gas-material discharge port 31b of the primary separation device 31 flows into the secondary separation device 32, and a second solid-gas separation is carried out in the secondary separation device 32 to separate the decomposed raw materials therefrom.

[0058] The secondary separation device 32 has a secondary material discharge port 32a and a secondary gas-material discharge port 32b, and the secondary gas-material discharge port 32b is communicated with the carbon recovery device 40. It can be understood that the secondary material discharge port 32a is used to discharge the separated materials, where the materials are the decomposed raw materials. The secondary gas-material discharge port 32b is used to discharge the separated gas part. The separated air flow is discharged from the secondary gas-material discharge port 32b and sent to the carbon recovery device 40 for recovery.

[0059] It can be understood that the structures of the primary separation device 31 and the secondary separation device 32 are not limited. For example, a cyclone can be used.

[0060] It can be understood that the particle size of the materials separated by the primary separation device 31 is not limited, as long as it can meet the requirement of separating the un-decomposed materials and allow the decomposed materials to pass through. In some embodiments, the particle size of the materials separated by the primary separation device 31 is greater than 45 microns.

[0061] It can be understood that a fan is provided in the air flow path to provide the power for the air flow to flow. In some embodiments, the fan is provided downstream of the secondary separation device 32.

[0062] In some embodiments, the carbon capture device includes a pre-combustion chamber 20 for generating a high-temperature airflow, and the pre-combustion chamber 20 is communicated with the airflow inlet 10 b of the carbon collection furnace 10 .

[0063] The primary material discharge port 31a is connected to the pre-combustion chamber 20. The primary material discharge port 31a is used to discharge undecomposed raw materials, and part or all of the discharged raw materials are sent to the pre-combustion chamber 20. It should be supplemented that the feeding amount of raw materials needs to be adjusted according to the temperature control requirements, which causes the amount of undecomposed raw materials to change. That is, the amount of materials discharged through the primary material discharge port 31a will change. In order to avoid the influence of the above-mentioned changing amount of materials on the temperature of the pre-combustion chamber 20, part or all of the solid materials will be selectively sent to the pre-combustion chamber 20.

[0064] In some embodiments, the secondary gas outlet 32b is connected to the pre-combustion chamber 20. The gas flow separated by the secondary separation device 32 is discharged from the secondary outlet and can flow into the pre-combustion chamber 20. The gas flow serves as the protection exhaust gas of the fuel pulverized coal under the condition of pure oxygen combustion, and at the same time provides conditions for the suspension of the raw meal in the carbon collection furnace 10 for material suspension heat exchange.

[0065] In order to further adjust the protection exhaust gas flowing into the pre-combustion chamber 20. In some embodiments, the carbon capture device includes an adjustment member, which is arranged at the connection between the carbon recovery device 40, the pre-combustion chamber 20 and the gas material secondary discharge port 32b, and the adjustment member is used to distribute the airflow to the carbon recovery device 40 and the pre-combustion chamber 20. In this way, the exhaust gas amount is controlled.

[0066] In some embodiments, the pre-combustion chamber 20 has an oxygen inlet 20a, and the oxygen gas flow out of the oxygen inlet 20a has a circumferential velocity. That is, the oxygen delivered into the pre-combustion chamber 20 can move in a circumferential direction, that is, around the inner wall of the pre-combustion chamber 20, thereby facilitating the dispersion of the fuel and allowing the oxygen to have sufficient time to contact and mix with the fuel, thereby improving the combustion rate of the fuel.

[0067] Specifically, the axis of the oxygen inlet 20a deviates from the axis of the pre-combustion chamber 20, so that the airflow introduced by the oxygen inlet 20a has a circumferential velocity. It can be understood that, when the initial velocity of the outflowing airflow remains unchanged, the greater the deviation, the greater the velocity of the outflowing airflow in the circumferential direction.

[0068] The oxygen inlet 20a may be connected to an oxygen generator 80, and the oxygen generator 80 is used to provide oxygen, and the oxygen enters the pre-combustion chamber 20 from the oxygen inlet 20a.

[0069] The pre-combustion chamber 20 has a second fuel feeding port. The second fuel feeding port is used to feed fuel into the pre-combustion chamber 20. The fuel can be pulverized coal. The fuel and oxygen burn to generate a high-temperature gas stream, which is transported into the carbon collection furnace 10. In order to enable the fuel to burn fully, in some embodiments, the second pulverized coal feeding port is arranged below the oxygen feeding port 20a.

[0070] In order to make full use of the heat in the gas stream discharged from the separation device 30. In some embodiments, the carbon capture device includes a high-temperature heat exchanger 50 and a medium-low temperature heat exchanger 60 arranged in sequence along the gas flow direction. The inlet of the high-temperature heat exchanger 50 is communicated with the separation device 30, the outlet of the high-temperature heat exchanger 50 is communicated with the inlet of the medium-low temperature heat exchanger 60, and the outlet of the medium-low temperature heat exchanger 60 is communicated with the carbon recovery device 40.

[0071] It can be understood that the gas stream flowing out of the second separation device exchanges heat through the high-temperature heat exchanger 50 to utilize the heat of the high-temperature gas to form sufficient water vapor for the waste heat power generation system, so as to recover the enthalpy in the combustion products as much as possible. After high-temperature heat exchange, since the gas stream temperature is still very high and does not meet the carbon recovery requirements, it needs to be further cooled. Therefore, the gas stream flowing out of the high-temperature heat exchanger 50 flows into the medium-low temperature heat exchanger 60 for secondary heat exchange and cooling.

[0072] Among them, before the gas stream flowing out of the second separation device flows into the high-temperature heat exchanger 50, it needs to go through desulfurization and denitration.

[0073] It can be understood that the inlet of the high-temperature heat exchanger 50 is located downstream of the regulating member, and the gas stream flows into the high-temperature heat exchanger 50 after passing through the regulating member. So that the regulating member can regulate the gas flow rate flowing into the high-temperature heat exchanger 50.

[0074] It should be noted that after the gas stream passes through the primary separation device 31 and the secondary separation device 32, there are still smaller particle-size particulate matters in the gas stream, which cannot meet the carbon recovery requirements. Therefore, further filtration is needed.

[0075] In some embodiments, the carbon capture device includes a bag filter device 70, and the bag filter device 70 is connected between the high-temperature heat exchanger 50 and the medium-low temperature heat exchanger 60. The bag filter device 70 is used to further filter the gas stream. Since the bag filter device 70 can only filter dry particulate matters, it is arranged after the high-temperature heat exchanger 50 and before the medium-low temperature heat exchanger 60. Since the gas stream here still has a relatively high temperature, the internal particulate matters can be kept dry, so as to achieve full filtration.

[0076] Please refer to Figure 2, an embodiment of the present application further provides a cement kiln system, which includes a carbon capture device and a cement kiln decomposition furnace 200. Among them, part or all of the materials discharged from the primary material discharge port 31a are sent into the cement kiln decomposition furnace 200, and the materials discharged from the secondary material discharge port 32a are sent into the cement kiln decomposition furnace 200.

[0077] It can be understood that the materials discharged from the primary material discharge port 31a are undissociated raw materials. When the pre-combustion chamber 20 cannot receive all the undissociated raw materials, the remaining part of the raw materials can be directly sent into the cement kiln decomposition furnace 200 for decomposition, and then processed into cement products. The materials discharged from the secondary material discharge port 32a are dissociated raw materials. The above-mentioned materials are directly discharged into the cement kiln decomposition furnace 200, which is convenient for subsequent processing into cement products.

[0078] An embodiment of the present application also discloses a carbon capture method, which is applicable to a cement kiln system. The carbon capture method includes:

[0079] S10. Send oxygen and fuel into the pre-combustion chamber 20, and the two burn to generate a high-temperature gas flow to heat the pre-combustion chamber 20 and the carbon collection furnace 10.

[0080] S20. According to the temperature in the carbon collection furnace 10, selectively feed raw materials into one or more of the raw material feeding ports 10d.

[0081] It can be understood that by selecting different raw material feeding ports 10d to feed raw materials, the temperature of different positions of the carbon collection furnace 10 can be adjusted. Temperature sensors can be set at different positions of the carbon collection furnace 10 for measurement.

[0082] S30. Transport the tail gas flowing out of the carbon collection furnace 10 to the first separation device for separation to obtain undissociated raw materials and gas flow.

[0083] S40. Send part or all of the undissociated raw materials back to the pre-combustion chamber 20, and transport the gas flow separated by the first separation device to the second separation device. The above gas flow is secondarily separated in the second device.

[0084] S50. Send the dissociated raw materials separated by the second separation device into the cement kiln decomposition furnace 200, send part of the gas flow separated by the second separation device back to the pre-combustion chamber 20, and transport the remaining part to the carbon recovery device 40.

[0085] In some embodiments, the cement kiln system includes a plurality of preheaters 300 for preheating raw materials. Among them, the preheater 300 is used to preheat the raw materials by using the waste gas heat discharged from the cement kiln decomposition furnace 200.

[0086] In step S20, the raw material fed into the raw material feeding port 10d can be selected from the raw material flowing out of each preheater 300. Thereby further controlling the temperature of the carbon collection furnace 10.

[0087] Please refer to Figure 1 , this application also provides a carbon collection furnace 10 for producing carbon dioxide. The carbon collection furnace 10 includes an air flow inlet 10b, an exhaust gas outlet 10c, and a plurality of raw material feeding ports 10d.

[0088] The air flow inlet and the exhaust gas outlet are arranged in sequence along the air flow direction. The air flow enters the carbon collection furnace 10 from the air flow inlet 10b and flows out of the carbon collection furnace 10 from the exhaust gas outlet 10c.

[0089] The raw material feeding port 10d is used for feeding raw materials into the carbon collection furnace 10. The plurality of raw material feeding ports 10d are arranged at intervals along the air flow direction. That is to say, the air flow flows in the carbon collection furnace 10 and passes through a plurality of raw material feeding ports 10d in sequence. It can be understood that the air flow flowing out of the exhaust gas outlet 10c carries raw material particles.

[0090] The raw materials are fed into the carbon collection furnace 10 from each raw material feeding port 10d and are heated and decomposed. The heating and decomposition process of the raw materials will absorb heat, thereby reducing the nearby temperature. By selecting different raw material feeding ports 10d to feed raw materials, the temperature of different regions of the carbon collection furnace 10 along the air flow direction can be controlled.

[0091] The carbon collection furnace 10 includes a first section 11 and a second section 12 arranged in sequence along the air flow direction. The air flow passes through the first section 11 and the second section 12 in sequence. Some of the raw material feeding ports 10d are arranged in the first section 11, and some of the raw material feeding ports 10d are arranged in the second section 12.

[0092] The exhaust gas outlet 10c is arranged at one end of the second section 12 far from the first section 11. The second section 12 is partially bent so that the exhaust gas outlet 10c faces downward. That is to say, the air flow needs to pass through the bent second section 12 and is discharged from the exhaust gas outlet 10c. This can extend the time of the air flow in the carbon collection furnace 10, and due to the inertia effect, the small particle materials in the air flow can change their positions inside the air flow when passing through the bent position, so that they can be fully mixed. The raw material feeding port 10d in the second section 12 can control the temperature of the second section 12, that is, control the temperature of the part of the carbon collection furnace 10 close to the exhaust gas outlet 10c to avoid high-temperature crusting.

[0093] In some embodiments, the first section 11 is arranged vertically, and the air flow flows from bottom to top. For the convenience of explanation, the following will take this as an example for illustration.

[0094] In order to further reduce high-temperature crusting, in some embodiments, the inner wall of the second section 12 includes a top wall 123 and a bottom wall that are oppositely arranged. Among them, in the direction of gravity, the top wall 123 is arranged higher than the bottom wall. The bottom wall includes a convex bulge, and the windward surface 121 and the leeward surface 122 of the bulge intersect to form a sharp angle. Among them, the convex bulge protruding inward is in the air flow path, the windward surface 121 is the surface facing the direction of air flow inflow, and the leeward surface 122 is on the back of the windward surface 121.

[0095] It should be noted that if the second section 12 is a circular pipe, the accumulation angle of its bottom wall is large and it is easy to accumulate crusting. By forming a sharp angle on the bottom wall of the second section 12 as described above, the accumulation angle is eliminated, making it difficult for the above-mentioned part to accumulate. And at the position of the above-mentioned sharp angle, due to the smaller cross-section, the air flow has a higher air flow velocity here, further reducing the possibility of accumulating crusting.

[0096] In order to fully mix the particulate materials in the air flow, in some embodiments, the top wall 123 of the second section 12 is perpendicularly arranged to the center line of the first section 11. It can be understood that in the first section 11, the air flow flows along the center line of the first section 11. By making the top wall 123 of the second section 12 perpendicular to the center line of the first section 11, the air flow flowing along the first section 11 will impact on the top wall 123 of the second section 12. Solid material particles with a certain weight will change their movement paths under the reaction force of the impact, and thus be fully mixed.

[0097] In some embodiments, the first section 11 has a plurality of annular constrictions 11a formed by inward constriction, and the plurality of constrictions 11a are arranged at intervals along the air flow direction. Among them, the inwardly constricted annular constriction 11a is a constriction 11a structure protruding inward. It can be understood that the above-mentioned constriction 11a can produce a spouting effect, making the solid material lag behind the air flow movement, contributing to the dispersion, mixing and heat exchange processes of the material, thereby improving the decomposition rate of raw meal.

[0098] It can be understood that the degree of constriction of the annular constriction 11a can be selected according to the size of the carbon collection furnace 10. In some embodiments, the diameter at the constriction 11a is 80% - 95% of the diameter of the carbon collection furnace 10.

[0099] It can be understood that the air flow inlet 10b can be used to introduce low-temperature air flow, which heats and decomposes the raw meal by generating high-temperature air flow through fuel combustion in the decomposition furnace. The air flow can also be used to introduce high-temperature air flow to heat and decompose the raw meal.

[0100] In some embodiments, the air flow inlet 10b is used to connect to the pre-combustion chamber 20, and the pre-combustion chamber 20 is used to generate high-temperature air flow. It can be understood that high-temperature air flow is generated in the pre-combustion chamber 20 and sent into the carbon collection furnace 10 through the air flow inlet 10b.

[0101] In some embodiments, the carbon collection furnace 10 includes a first fuel feeding port through which fuel is fed into the carbon collection furnace 10. The fuel fed into the carbon collection furnace 10 burns to release heat for heating and decomposing the raw material and releasing carbon dioxide. It should be noted that when the air flow inlet 10b is connected to the pre-combustion chamber 20 and high-temperature air flow flows in, the fuel fed through the above-mentioned first fuel feeding port can further burn to release heat.

[0102] The carbon collection furnace 10 can be provided with a plurality of temperature, pressure, and gas composition detection devices to facilitate timely adjustment of the proportion of coal feeding amount, pure oxygen amount for combustion support, and raw material amount according to the furnace conditions, ensuring the rationality of the matching of air, coal, and materials.

[0103] In some embodiments, the carbon collection furnace 10 includes a first section 11 arranged vertically. The air flow inlet 10b is arranged at the lower end of the first section 11. A dust discharging device is arranged at the lower end of the first section 11 for discharging the settled ash and slag. It can be understood that some ash and slag will deposit at the bottom and need to be cleaned regularly. By arranging the above-mentioned dust discharging device, it is possible to conveniently clean the above-mentioned ash and slag.

[0104] It can be understood that in order to install the dust discharging device, a dust discharging port is arranged at one end of the first section 11, and the dust discharging device is arranged at the position of the above-mentioned dust discharging port. In some embodiments, in order to reduce air leakage during the dust discharging process, the dust discharging device includes an air lock device for maintaining the tightness of the system, preventing air leakage, and allowing solid materials to pass through without causing a large amount of gas leakage.

[0105] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A carbon capture device, characterized in that: The carbon capture device comprises: A carbon collecting furnace for producing carbon dioxide, the carbon collecting furnace having an air flow inlet and an exhaust gas outlet arranged in sequence along the air flow direction, and the carbon collecting furnace also having a plurality of raw material feeding ports arranged at intervals along the air flow direction; A separation device, connected to the tail gas outlet of the carbon collecting furnace, and capable of separating undecomposed raw materials; A carbon recovery device is connected to the separation device, and the carbon recovery device is used to recover carbon dioxide.

2. The carbon capture device according to claim 1, characterized in that: The separation device comprises a primary separation device and a secondary separation device; The primary separation device is connected to the tail gas outlet of the carbon collecting furnace, and the primary separation device has a primary material discharge outlet and a gas material discharge outlet, and the primary material discharge outlet is used to discharge undecomposed raw materials; The secondary separation device is connected to the primary gas-material discharge port, and has a secondary material discharge port and a secondary gas-material discharge port. The secondary material discharge port is used to discharge the decomposed raw meal, and the secondary gas-material discharge port is connected to the carbon recovery device.

3. The carbon capture device according to claim 2, characterized in that: The particle size of the material separated by the primary separation device is greater than 45 microns.

4. The carbon capture device according to claim 1, characterized in that: The carbon collection furnace includes a first section and a second section connected in sequence along the airflow direction, the exhaust gas outlet is arranged at an end of the second section away from the first section, the second section is partially bent so that the exhaust gas outlet faces downward, and part of the raw material feeding port is arranged in the second section.

5. A cement kiln system, characterized in that: The cement kiln system comprises: The carbon capture device according to any one of claims 2 to 3; and Cement kiln calciners, used to decompose raw materials; Part or all of the material discharged from the primary material discharge port is fed into the cement kiln decomposition furnace, and the material discharged from the secondary material discharge port is fed into the cement kiln decomposition furnace.

6. A carbon collection furnace, characterized in that: The carbon collecting furnace is used to produce carbon dioxide, and the carbon collecting furnace has an air flow inlet and an exhaust gas outlet arranged in sequence along the air flow direction, and the carbon collecting furnace also has a plurality of raw material feeding ports arranged at intervals along the air flow direction; The carbon collection furnace includes a first section and a second section connected in sequence along the airflow direction, the exhaust gas outlet is arranged at an end of the second section away from the first section, the second section is partially bent so that the exhaust gas outlet faces downward, and part of the raw material feeding port is arranged in the second section.

7. The carbon collecting furnace according to claim 6, characterized in that: The inner wall of the second section includes a top wall and a bottom wall which are arranged opposite to each other. The bottom wall includes a protrusion protruding inwardly. The windward surface and the leeward surface of the protrusion intersect to form a sharp angle.

8. The carbon collecting furnace according to claim 6, characterized in that: The first section is arranged vertically; The inner wall of the second section includes a top wall and a bottom wall that are oppositely disposed, and the top wall of the second section is disposed perpendicular to the center line of the first section.

9. The carbon collecting furnace according to claim 6, characterized in that: The first section has a plurality of annular contractions formed by inward contraction, and the plurality of contractions are arranged at intervals along the airflow direction.

10. The carbon collecting furnace according to claim 6, characterized in that: The first section is arranged vertically, the air flow inlet is arranged at a downward end of the first section, and an ash discharge device is arranged at the downward end of the first section to discharge settled ash.

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